rating-form-validation-filters.php

function my_custom_comment_form_validation( $validation_results ) {
    array_push( $validation_results, array(
            'severity' => 'error',
            'name' => 'my_custom_error2',
            'field' => null,
            'message' => __( 'My custom error 1', 'my-text-domain' )
    ) );
     
    return $validation_results;
}
add_filter( 'mrp_after_comment_form_validation', 'my_custom_comment_form_validation', 10, 1 );
 
function my_custom_rating_form_save_validation( $validation_results, $data ) {
    array_push( $validation_results, array(
            'severity' => 'error',
            'name' => 'my_custom_error2',
            'field' => null,
            'message' => __( 'My custom error 2', 'my-text-domain' )
    ) );
     
    return $validation_results;
}
add_filter( 'mrp_after_rating_form_validation_save', 'my_custom_rating_form_save_validation', 10, 2 );
 
function my_custom_rating_form_update_validation( $validation_results, $data ) {
    array_push( $validation_results, array(
            'severity' => 'error',
            'name' => 'my_custom_error3',
            'field' => null,
            'message' => __( 'My custom error 3', 'my-text-domain' )
    ) );
     
    return $validation_results;
}
add_filter( 'mrp_after_rating_form_validation_update', 'my_custom_rating_form_update_validation', 10, 2 );